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When we updated the comment flag reasons back in July/August, the modal was moved over to the Stacks design (as rene guessed). We haven't needed to update the content of the post flags - or close modal on questions, or ... well, lots of other site elements - so they're still using the old styling.

It's probably just as well that we didn't update them all, since the initial implementation was missing at least one popular feature - which we've now added back in.

We'll be updating these modals before long, sometime in the next 6-8. Thanks for your patience while we work through this transition!